JPS61162869A - Testing device of compact disk player - Google Patents

Abstract

PURPOSE:To test a compact disk player easily and accurately by digitizing parallel data outputted from a series/parallel converter and displaying the digitized data. CONSTITUTION:When a search command is outputted from a microprocessor 51 to a controlling circuit, the microprocessor 51 reads parallel data outputted from a series/parallel converter 49, and converts them into a hexadecimal number. A controlling signal is applied to a CRT controller 57, and data corresponding to the hexadecimal number are stored in an area corresponding to CRT picture of a video RAM58, and the hexadecimal number EO is displayed on the area of the CRT picture. A series/parallel converter that converts serial data into parallel data, a device that digitizes parallel data outputted from the series/parallel converter and a device that displays the digitized data are provided, and serial data inputted/outputted to and from the microprocessor are digitized and displayed. Thus, a compact disk player can be tested easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a testing device for compact disc players.

BACKGROUND OF THE INVENTION Compact disc players that irradiate a compact disc, which is a conventional recording medium, with laser light and reproduce the stored contents of the compact disc based on the reflected light have become popular in recent years.

FIG. 4 is a program diagram showing an example of the configuration of a compact disc player, in which 1 is a microprocessor, 2 is a memory, 3 is a display section, 4 is an operation section, 5 is an input section, 6 is an output section, 7 is a compact disc, 8 is a disc motor that rotates the compact disc 7, 9 is a pickup,
10 is a semiconductor laser, 11.14.15 is a lens, 12
is a beam splitter, 13 is a quarter-wave plate, 16 is a detector, 17 is a tracking coil that moves the lens 14 in the radial direction of the compact disk 7, 18 is a focus coil that moves the lens I4 in the vertical direction, and 19 is a tracking Servo circuit, 20 is a focus servo circuit, 21 is a matrix circuit, 22 is a demodulation circuit, 24 is a rotation control circuit, 24 is a signal processing circuit, 5 is a separation circuit, 26 is D
A converter, 27 is a low-pass filter, 28 is an amplifier, 2
9 is a speaker, 30 is a control circuit, 31 is a feed motor control circuit, 32 is a feed motor, and 33 is a feed screw.

Furthermore, FIG. 5 shows a frame structure of information stored on the compact disc 7, and one frame consists of an area S in which subcodes are stored, and
It consists of an area where data corresponding to reproduced sound is stored and an area E where error correction codes are stored. Furthermore, as shown in the figure, 7 bits are allocated to the area S, and the most significant bit is the bit allocated to indicate the song number TNO, and the second bit is the bit that is allocated to indicate the elapsed playing time of the song. The 3rd bit is the unit of minutes (SE) of the elapsed performance time of the song, the 4th bit is the frame number PR (0 to 7) of each second.
Numerical values up to 4 are assigned, and O to O in each 1 second.
75 of 74 frames are played)
, the 5th bit is Ml to the minute unit of the performance start time from the first song, the 6th bit is the unit of %SE of the elapsed performance time from the 1st song, and the 7th bit is to each second. This bit is assigned to indicate the FR to the frame number in the frame number. In addition, the TNO, old 1-1^FR, etc. mentioned above are all 8 bits and are one piece of significant data, and by playing back 8 frames shown in the same figure, the song number TNO, frame number PR It is possible to obtain significant data showing the following.

Table 1 also shows the microprocessor 1 to control circuit 3.
It shows some of the types of commands added to 0 and their bit/node configurations.

Table 1 Note that the stop command stops the disk motor 8,
This is a command to end the play and search operations. The play command is a command used to play the compact disc 7. The search command moves the pickup to the target position (elapsed playing time from the first song, i.e. 1 minute, 1 second, The FF command is the command used to send the pickup 9 to the outermost circumference of the compact disc 7, and the FB command is the command used to send the pickup 9 to the innermost part of the compact disc 7. This is a command used when sending messages to someone else.

In addition, when a search command is sent out, data indicating the target position is sent out following the search command, as shown in FIG.

In the example shown in FIG. 6, the target position is 5 minutes 16 seconds and 0 frames.

When reproducing the stored contents of the compact disc 7, the operator turns on a play button (not shown) provided on the operation section 4. As a result, the microprocessor 1 controls the output unit 6 to set the signal line R/W to "1", and the signal line R/W becomes "1" only during the period when the microprocessor 1 sends a signal to the control circuit 30. Then, an 8-bit play command is serially sent to the control circuit 30 via the signal line Dout. As a result, the control circuit 30 applies a control signal to the feed motor control circuit 31 to feed the pickup 9 toward the outer circumference of the compact disc 7 at a predetermined speed, and starts the operation of the rotation control circuit 7 to play the compact disc 7. Start.

During reproduction, the laser beam from the semiconductor laser 10 passes through the lens 11.
．． Beam splitter 12. 1/4 wavelength plate 13, lens 1
4, and the reflected light from the compact disc 7 passes through a lens 14 and a 174-wavelength plate 1.
3. Beam splitter 12. The light enters the detector 16 via the lens 15. A plurality of detectors 16 (for example, four
The output signal of each photodiode is applied to a matrix circuit 21, and the matrix circuit 21 generates an RF signal a, a rough king signal and a focus signal C based on the electric signal from the detector 16. and demodulating circuits 22 . It is added to the tracking servo circuit 19 and the focus servo circuit 20.

The tracking servo circuit 19 drives the tracking coil 17 based on the tracking signal
Adjust lens 1 so that the center of lens 6 (optical axis) coincides with the track.
4 in the radial direction of the compact disc 7, the focus servo circuit 21 drives the focus coil 18, and moves the lens 14 in the vertical direction so that the detector 16 is in focus on the compact disc 7.

Further, the demodulation circuit 22 demodulates the RF signal a and applies it to the signal processing circuit 24, and also extracts a synchronization signal and applies it to the rotation control circuit.

The rotation control circuit 23 compares the frequency of the synchronization signal applied from the demodulation circuit 22 with the reference frequency, and controls the rotation speed of the disk motor 8 so that the two match, and the signal processing circuit 24 controls the rotation speed of the disk motor 8 based on the error correction code. Correct errors. The signal whose error has been corrected by the signal processing circuit U is then sent to the D^ converter 26. The signal is applied to the speaker 4 via the low-pass filter 27 and the amplifier 28, and a reproduced sound corresponding to the contents stored on the compact disc 7 is output from the speaker 29.

Further, the separation circuit 5 extracts the subcode stored in the area S shown in FIG. 5 and adds it to the control circuit 30. When the subcodes for 8 frames are added to the control circuit 30,
First, the signal line WQ is set to "1" for a predetermined time, then the Q code QSTA indicating the internal state of the 8-bit configuration is serially sent to the signal line Din in synchronization with the clock signal GK applied from the microprocessor 1, and then the separation circuit A Q code QTNO indicating an 8-bit song number TNO created based on the subcode added from the device is serially sent out in synchronization with the clock signal CK, and hereafter the minutes of the elapsed performance time of the song are sent out serially in synchronization with the clock signal CK. Q code QMI indicating the unit Ml of
, Q code QSE indicating the unit of seconds within the elapsed performance time of the song, Q code QFR indicating the frame number PR within each second The unit of minutes within the elapsed performance time from the 11th song ^Old Q code QAMT indicating the performance time, Q code QAS indicating the unit of seconds ASE of the elapsed performance time from the first song
E, Q code QAP indicating frame number APR within each second
R is serially output to the signal line Din in synchronization with the clock signal C. In addition, FIG. 7 shows the control circuit 3.
It shows the Q code sent from 0 to microprocessor l.

Table 2 shows an example of the configuration of the Q code QSTA that indicates the internal state, and the most significant bit ISI&N indicates whether the current position is in ten directions, one direction, or coincides with the target position being searched. This is a bit to indicate the second .
Third bit S2. SL is a bit for indicating the mode being searched, and the 4th. The 5th bits 8F and 4F are bits to indicate the frame time error at the time of search convergence, the 6th bit MZ is a bit to indicate whether disk mode 8 is stopped, and the 7th bit FOC is This is a bit to indicate whether the focus is on or not.
The least significant bit N (1 is a bit for indicating whether the subcode is correct or not.

When reproducing the second table, the above-described operations are performed, and the contents stored on the compact disc 7 are reproduced.

Next, the operation at the time of search will be explained. When performing a search operation, the operator inputs data indicating the target position (
Song number TNO and elapsed performance time of the song (old), St
! , PR) and at the same time turn on the search button provided on the operation section 4. As a result, the microprocessor l first sets the signal line R/W to "1" as shown in FIG. Elapsed performance time from song number AM1.^SE,^F
Data indicating R, each consisting of 8 bits) is serially applied to the control circuit 30 via the signal line Din, and then the signal line R/W is set to "0". Control circuit 3
0 thereby determines the difference between the target position and the current position of the pickup 9, and applies a control signal to the feed motor control circuit 31 to move the pickup 9 by an amount corresponding to this difference. As a result, the feed motor control circuit 31 rotates the feed motor 32 at a high speed, and rapidly advances the pickup 9 by the commanded amount. When the pink-up 9 is fast-forwarded by the commanded amount, the control circuit 30 determines the current position of the pickup 9 based on the subcode added from the separation circuit section, and then determines the difference between this current position and the target position.

If there is a difference between the current position and the target position, the above-mentioned processing is performed again, and if the two match, the fourth position of Qyaw 1% QST^ indicating the internal state is returned. 5th Pitsu) 8F.

Set data indicating that the two match in 4F.

The microprocessor 1 receives the fourth .Q code indicating the internal state which is applied via the input section. 5th bit 8F
, 4F, when it is detected that the current position of the pickup 9 matches the target position, the signal line R/W is set to 1'', and then the signal line Di
An 8-bit configuration Florei command (1000
0000) to the control circuit 30, and then the signal line R/W
As a result, the control circuit 30 operates in the same manner as during reproduction described above, and the reproduced sound corresponding to the contents stored on the compact disc 7 is outputted from the speaker 29.

In this way, the compact disc player exchanges a large amount of data (Q codes, commands, etc.) between the microprocessor l and the control circuit 30, and controls the operation of each part of the device based on this data. from,
During product testing, it is not enough to simply operate the product and see if it operates normally. Therefore, conventionally, data exchanged between the microprocessor 1 and the control circuit 30 is displayed on an oscilloscope or the like, and based on the displayed image, it is tested whether the product is normal or not. However, since the oscilloscope simply displays the signal waveform of the serial data exchanged between the microprocessor 1 and the control circuit 30, testing using this method requires considerable skill. there were.

Problems to be Solved by the Invention The present invention has solved the above-mentioned problems, and its purpose is to enable easy and accurate testing of compact disc players.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a test device for a compact disc player in which serial data is exchanged between a microprocessor and each part of the device.
a serial-to-parallel converter for converting serial data input to the microprocessor or serial data output from the microprocessor into parallel data; and digitization means for digitizing the parallel data output from the serial-to-parallel converter. , and display means for displaying the digitized data digitized by the digitization means.

Since the data input and output from the microprocessor is digitized and displayed on the effect display means, the test can be easily and accurately performed.

Embodiment FIG. 1 is a block diagram of an embodiment of the test apparatus according to the present invention, in which 40 is a terminal connected to the signal line R/W shown in FIG. 4, and 41 is a terminal connected to the signal line R/W shown in FIG. 4. A terminal connected to the line Din, 42 a terminal connected to the signal line Dout shown in FIG. 4, a terminal to which the clock signal C from the microprocessor 1 is input, 44 an inverter, 45.4
6 is an AND gate, 47 is an OR gate, 48 is a D flip-flop, 49 is a serial/parallel converter, 50 is an octal counter, 51 is a microprocessor, 52 is an input section, 54 is a memory, 54 is an operation section, and 55 is an octal counter. 5 is a start button provided on the operation section 54; 56 is a stop button provided on the operation section 54; 57 is a CRT controller; 58 is a video RAM;
9 is a character generator, the mark is a video signal converter,
61 is a CRT, and 62 is a terminal to which the signal line portion shown in FIG. 4 is connected.

Also, as shown in Figure 2, the CRT61 screen has 8 lines x
The video RAM 5B is divided into nine columns of areas, and the video RAM 5B also has areas corresponding to each area of the CRT screen.

Further, FIG. 3 is a flowchart showing the processing contents of the microprocessor 51, and the operation of FIG. 1 will be explained below with reference to the same figure.

During the test, the terminal 40 is connected to the signal line R/W shown in FIG. 4, the terminal 41 is connected to the signal line Din, and the terminal 42 is connected to the signal line D.
The terminal 62 is connected to the signal line WQ, and the clock signal CK from the microprocessor 1 is applied to the terminal 62. Here, the signal line R/W is connected from the microprocessor 1 to the output section 6. When 8-bit serial data is sent to the control circuit 30 via the signal line Dout, it becomes "1"; otherwise (from the control circuit 30 to the signal line Din, and via the input section 5 to the microprocessor 1) If 8-bit serial data is added to the terminal 42., the data will be "0", so if the microprocessor l is sending data to the control circuit 30, the data will be sent to the terminal 42. When data is applied to the serial-to-parallel converter 49 via the AND gate 46 and the OR gate 47 and sent from the control circuit 30 to the microprocessor 1, the data is sent to the terminals 41. Serial to parallel converter 4 via AND gate 45 and OR gate 47
It will be added to 9.

Further, the serial/parallel converter 49 converts the 8-bit serial data applied via the OR gate 47 into parallel data in synchronization with the clock signal C applied via the terminal 43, and applies it to the input section 52. Also, the counter 50 increments each time the clock signal CK is applied, and when the count value reaches "7", the next clock signal C is applied.
The output signal RQ is kept at "1" until K is added. That is, by reading the output signal of the serial/parallel converter 49 at the timing when the output signal RQ of the counter father becomes "1", the microprocessor 51 converts the parallel data converted into serial/parallel by the serial/parallel converter 49. It is something that can be read. Further, the D flip-flop 48 operates on the signal line R at the rising edge of the clock signal CK.
It latches the state of /W, and its Q terminal output indicates the state of signal line R/W.

Further, the microprocessor 51 starts the process shown in the flowchart of FIG. 2 when a start button 55 provided on the operation unit 56 is pressed.
When is pressed, the count value CNTA of the counter A, which is provided internally by software, is set to "1".
Step S1), then set the count value CNT8 of column 'counter B to "2" and step S2), then step D
Based on the Q terminal output of the flip-flop 48, the signal line R
It is determined whether the state of /W is "1", that is, whether data is being sent from the microprocessor 1 to the control circuit 30 (step S3).

For example, if the search command (11100000) shown in FIG. 6 is output from the microprocessor 1 to the control circuit 30, the determination result in step s3 is YES.
Therefore, the microprocessor 51 performs the process of step S4. When it is determined in step S4 that the output signal 12Q of the counter 50 has become "1", the microprocessor 51 reads the parallel data output from the serial/parallel converter 49 (step S5), and then converts the read parallel data into Convert to hexadecimal (step 36)
. In this case, since the parallel data is 11100000, the converted hexadecimal number is EO. Next, a control signal is applied to the CRT controller 57, and the C of the video RAM 5B is
Step S is applied to the area corresponding to area (1, 2) of the RT screen.
The data corresponding to the hexadecimal number obtained in step 6 is stored (step S7). And this results in the area of the CRT screen (
1, 2), the hexadecimal number EO obtained in step S6 is displayed as shown in FIG. Next, the microprocessor 51 reads the CRT screen area (1,
Data representing R is stored in the area corresponding to 2) (step 3B). And this results in the area of the CRT screen (
1, 2), R is displayed as shown in FIG.

Next, the microprocessor 51 increments the count value CNTA of the row counter A by +1 (step S9), and then determines whether the count value CNTA of the row counter A has become "9" (step S510). And step 31
If the determination result of 0 is NO, the microprocessor 51
performs the process of step S2, and if the determination result is YES, that is, if data up to eight lines on the CRT screen have been displayed, the process is terminated.

In this case, the count value CNTA of row counter A is “2”
Therefore, the microprocessor 51 performs the process of step S2. In the case of a search command, as mentioned above, the search command is followed by serial data (minutes, seconds) indicating the target position.

frame number) is sent from the microprocessor l to the control circuit 3.
0, the microprocessor 5
1 is the parallel data (0000010
Convert 1) into hexadecimal number (07) and display it in area (2, 2) of the CRT screen as shown in Figure 2, then display R in area (2°1) of the CRT screen, Next, set the parallel data (00001111) indicating the unit of seconds to 1.
Convert to hexadecimal number (15) and get CRT screen area (3,2)
Then, R is displayed in area (3, 1) of the CRT screen, and then the frame number (00000000) is converted to hexadecimal (00) and R is displayed in area (4, 2) of the CRT screen.
), then R is displayed in area (4,1) of the CRT screen.
to be displayed.

When the search is completed, the control circuit 30 selects each Q code (QSTA, QTNO) shown in FIG. 7 as described above.
.

Q old, 11st! , QFR, 口^M1. QASI!
, QAFR), the signal line R
/W becomes "0", the determination result in step S3 becomes NO, and the microprocessor 51 performs the process in step Sll. Then, in step 311, the signal line -〇 is “1”.
', the microprocessor 51 determines the timing at which the output signal RQ of the counter 50 becomes "1" (
In step 512), the parallel data output from the serial/parallel converter 49 (in this case, the parallel data of the Q code QSTA indicating the internal state) is read (step 7 step 513), and then the read parallel data is Base number (
In this case, it is assumed that it is F9).
), then the video RAM CRT screen area (5,2)
The hexadecimal number (F
9) is stored (step 515). As a result, the hexadecimal number (F9) obtained in step 514 is displayed in area (5, 2) of the CRT screen, as shown in FIG. Next, the microprocessor 51 writes data representing W in the area corresponding to area (5, 1) of the CRT screen in the video RAM 5B (step 816). As a result, W is displayed in area (5, 1) of the CRT screen.

Next, the microprocessor 51 increments the count value CNTB of the column counter B by 1 (step 517), and then checks whether the count value CNTB has become "10", that is, CR
It is determined whether data up to the 9th column of the T screen has been displayed in hexadecimal (step 318). And step 31
If the determination result of B is Is, the microprocessor 51
The process of step S9 is performed, and if the determination result is NO, the process of step 312 is performed. In this case, since the count value CNTB of the column counter B is "3", the microprocessor 51 will perform the process of step S12. Then, the microprocessor 51 inputs QMf, (ISE, Q
Fl? , QAMr, QASE, and 0APR are sequentially converted into hexadecimal numbers (02, 01, 28, 00, 07, 15, 00), and these are converted into the CRT screen area (5
,3).

(5,4), (5,5), (5,6), (
5,7).

Display on (5, 8) and (5, 9).

In this way, when a search command is output from the microprocessor l, it is not only determined whether the search command was output correctly based on the first to fourth lines of the CRT screen, but also the fifth line It is also possible to judge whether the search has been performed accurately based on the displays in the 7th to 9th columns and the displays in the 2nd to 4th rows.

The 6th line in FIG. 2 is an example of the display when the play command (10000000) is output from the microprocessor l, and the 7th and 8th lines are the display example when the Q code is output from the control circuit 30. This is a display example.

In this way, according to this embodiment, the serial data exchanged between the microprocessor l and the control circuit 30 is digitized and displayed on the CRT screen.
Compact disc players can be tested easily and accurately.

Although not explained in the above embodiment, when the stop sum 56 provided on the operation section 55 is pressed, the microprocessor 51 terminates the processing by interrupt processing.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides serial data (Q code in the embodiment) input to a microprocessor (microprocessor l in the embodiment) or output from the microprocessor. a serial-to-parallel converter for converting serial data (commands shown in Table 1 in the embodiment) into parallel data; a digitizing means for digitizing the parallel data output from the serial-to-parallel converter; It is equipped with a display means for displaying the digitized data digitized by the digitization means, and the serial data input/output to the microprocessor is digitized and displayed on the display means, so it is easy to test compact disc players. This method has the advantage that it can be performed easily and accurately.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a CR
7 is a plan view of the screen, FIG. 3 is a flowchart showing the processing contents of the microprocessor 51, FIG. 4 is a block diagram showing an example of the configuration of a compact disc player, and FIG. 5 is a frame of information stored on the compact disc. FIG. 6 is a diagram showing the bit structure of the search command, FIG. 7 is a diagram showing one type of Q code 9, and FIG. 8 is an explanatory diagram of the operation when sending the search command. 1.51 is microprocessor, 2.53 is memory, 3
is a display section, 4 is an operation section, 5 is an input section, 6 is an output section, 7 is a compact disk, 8 is a disk motor that rotates the compact disk 7, 9 is a pink up, 10 is a semiconductor laser, 11.14.15 is a lens, 12 is a beam splitter, 13 is a quarter-wave plate, 16 is a detector,]
7 is a tracking coil, 18 is a focus coil, 1
9 is a tracking servo circuit, 20 is a focus servo circuit, 21 is a matrix circuit, 22 is a demodulation circuit, 24 is a rotation control circuit, 24 is a signal processing circuit, 25 is a separation circuit, 2
6 is a DA converter, 27 is a low-pass filter, 27 is an amplifier, 29 is a speaker, 30 is a control circuit, 31 is a feed motor control circuit, 32 is a feed motor, 33 is a feed screw, 40 to 43.62 are terminals, 44 is an inverter, 45.
46 is an AND gate, 47 is an OR gate, 48 is a D flip-flop, 49 is a serial/parallel converter, 50 is a counter, 52 is an input section, 57 is a CRT controller, 58 is a video RAM, 59 is a character generator, 60 is a video signal The converter 61 is a CRT. Patent Applicant: Fujitsu Ten Ltd. Representative Patent Attorney Gobe Tamamushi (one other person) Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Bit

Claims (1)

[Claims] In compact disc player testing equipment that exchanges serial data between a microprocessor and various parts of the device, serial-parallel processing converts serial data input to the microprocessor or serial data output from the microprocessor into parallel data. It is characterized by comprising a converter, a digitizing means for digitizing the parallel data output from the serial-parallel converter, and a display means for displaying the digitized data digitized by the digitizing means. Test equipment for compact disc players.